In the fields of lighting, display, backlight, etc., LED has become the mainstream light source due to its advantages of energy saving, longevity, and high brightness. The core of its performance and quality comes from the precise and complex processing technology behind it. From the semiconductor substrate to the final packaged product, LED processing requires multiple key processes, and the precision control of each step directly determines the luminous efficiency, stability, and service life of the LED. Nowadays, with the rise of new technologies such as Mini/MicroLED,LED processing technologyUpgrade towards the direction of "refinement and integration" to provide stronger support for application scenarios. ​

The primary core of LED processing technology is epitaxial growth: laying the foundation for luminescence. Epitaxial growth is a key step in growing LED light-emitting layers on semiconductor substrates, and currently the mainstream method is MOCVD technology. This process requires precise delivery of metal organic compounds and reaction gases such as ammonia to the substrate surface under high temperature and high vacuum conditions, controlling the growth rate and film thickness to form GaN based quantum well structures - which are the core of LED for achieving electro-optical conversion. For example, to improve the luminous efficiency of blue LED, it is necessary to optimize the recombination efficiency of electrons and holes by adjusting the number and width of quantum wells; For MiniLED, the uniformity error of the epitaxial layer needs to be controlled within ± 5% to ensure consistent brightness of the mass-produced LED. ​

Next is chip manufacturing: precise carving of core structures. After the epitaxial wafer is completed, the electrodes and current spreading layer of the LED chip need to be fabricated through processes such as photolithography, etching, and evaporation. The photolithography process uses ultraviolet light to transfer circuit patterns to the surface of epitaxial wafers, with a line width accuracy of 1-2 μ m, ensuring uniform electrode layout; Dry etching precisely removes excess epitaxial layers through plasma to form the structure of the chip, controlling the etching depth error within ± 0.1 μ m to avoid damaging the light-emitting layer; The vapor deposition process deposits metal electrodes on the surface of the chip to ensure uniform current injection and reduce local overheating caused by current crowding. For MicroLED, reducing the chip size to below 100 μ m requires the use of more precise lithography equipment and flip chip technology to achieve high-density integration of the chip. ​

Finally, there is the packaging process: balancing protection and performance optimization. LED chips need to be packaged to achieve electrical connections, mechanical protection, and light efficiency optimization, with different packaging processes corresponding to different application scenarios. COB technology is commonly used in the field of lighting, which integrates multiple LED chips on a metal substrate and forms a surface light source through silicone packaging. The heat dissipation efficiency is 30% higher than traditional discrete packaging; MiniLEDs in the display field are packaged in SMT or COG, paired with high-precision optical lenses to control the light angle error within ± 2 °, ensuring the clarity and contrast of the display image; In addition, the choice of packaging materials is also crucial - the use of high light transmittance, anti-aging silicone or epoxy resin can extend the service life of LED to more than 50000 hours to avoid the problem of light attenuation caused by long-term use. ​

With the diversified development of LED applications, innovation in processing technology has never stopped. From precise temperature control in epitaxial growth to micro integration in chip manufacturing, to optimized heat dissipation in packaging processes, every technological breakthrough has propelled LED performance to new heights.